NORTH ROYALTON, Ohio -- An affidavit filed in Pennsylvania court by a confidential informant says that the wife of a doctor who was shot and killed on the Ohio Turnpike was paying her lover's rent. She was allegedly going to try to seek millions as part of a divorce from her husband, NewsChannel5 reported.

SLIDESHOW: Doctor Shot In Head On Turnpike

Bradford is a person of interest in the Ohio Turnpike shooting of Dr. Gulam Moonda. Bradford's mother, Sharon Bradford, said her son was having an affair with the victim's wife, Donna Moonda.

On Monday, officials arrested Bradford, 23, of Monaca, Pa. He was arrested on unrelated drug charges at his Pennsylvania home.

Moonda was shot in the head on May 13 when he pulled over on the Ohio Turnpike to change drivers.

Sharon Bradford told the media on Monday that her son was having an affair with the doctor's 46-year-old wife.

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Mother Says Son Loves Victim's Wife Turnpike 911 Call

She said that the two met in a drug rehabilitation center. Donna Moonda was convicted last year on drug charges.

Gulam Moonda was a passenger in a 2000 Jaguar being driven by his wife when he was shot. His mother-in-law, Dorothy Smouse, 74, was also in the vehicle.